EP0990894A3 - Verfahren zum Bestimmen der Elektrischen Leitfähigkeit von Flüssigkeiten - Google Patents

Verfahren zum Bestimmen der Elektrischen Leitfähigkeit von Flüssigkeiten Download PDF

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Publication number
EP0990894A3
EP0990894A3 EP99118100A EP99118100A EP0990894A3 EP 0990894 A3 EP0990894 A3 EP 0990894A3 EP 99118100 A EP99118100 A EP 99118100A EP 99118100 A EP99118100 A EP 99118100A EP 0990894 A3 EP0990894 A3 EP 0990894A3
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EP
European Patent Office
Prior art keywords
liquids
determining
electrical conductivity
rfl
ohmic resistance
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EP99118100A
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English (en)
French (fr)
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EP0990894A2 (de
EP0990894B1 (de
Inventor
Harald Dr. Ing. Riegel
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Endress and Hauser Conducta GmbH and Co KG
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Endress and Hauser Conducta Gesellschaft fuer Mess und Regeltechnik mbH and Co KG
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Publication of EP0990894A3 publication Critical patent/EP0990894A3/de
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G01N27/07—Construction of measuring vessels; Electrodes therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/22—Measuring resistance of fluids

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

Die Erfindung betrifft ein Verfahren zum Bestimmen der elektrischen Leitfähigkeit von Flüssigkeiten mittels konduktiv betreibbaren Leitfähigkeitsmesszellen in der Analysen- und Prozessmesstechnik, wobei aus einem gemessenen Widerstandswert und der geometrischen Messzellenkonstanten (k) die Leitfähigkeit der Flüssigkeit bestimmt wird; um Fehler bei der Bestimmung der elektrischen Leitfähigkeit zu reduzieren, wird diese in folgender Weise bestimmt:
  • Unter Verwendung eines Messumformers wird bei wenigstens zwei Frequenzwerten einer Wechselspannung die Impedanz der in die Flüssigkeit eintauchenden Messzelle ermittelt,
  • aus den ermittelten Impedanzwerten wird unter Zugrundelegung eines Ersatzschaltbildes bestehend aus einer Parallelschaltung eines die Messzellenkapazität darstellenden Kondensators (CZelle) und eines den gesuchten Widerstand der Flüssigkeit innerhalb der Leitfähigkeitsmesszelle darstellenden ohmschen Widerstands (Rfl) sowie eines elektrischen, frequenzunabhängige Parameter (n, Q) aufweisenden Bauelements (ZM/Fl) mit einer frequenzunabhängigen Phase, wobei die zuletzt genannten (Rfl, ZM/Fl) in Reihe zueinander geschaltet sind, die frequenzunabhängigen Parameter (n, Q) und der gesuchte Widerstand (Rfl) bestimmt.
    • Figure 00000001
    EP99118100A 1998-09-29 1999-09-27 Verfahren zum Bestimmen der Elektrischen Leitfähigkeit von Flüssigkeiten Expired - Lifetime EP0990894B1 (de)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19844489A DE19844489A1 (de) 1998-09-29 1998-09-29 Verfahren zum Bestimmen der elektrischen Leitfähigkeit von Flüssigkeiten
    DE19844489 1998-09-29

    Publications (3)

    Publication Number Publication Date
    EP0990894A2 EP0990894A2 (de) 2000-04-05
    EP0990894A3 true EP0990894A3 (de) 2001-03-28
    EP0990894B1 EP0990894B1 (de) 2006-11-22

    Family

    ID=7882546

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP99118100A Expired - Lifetime EP0990894B1 (de) 1998-09-29 1999-09-27 Verfahren zum Bestimmen der Elektrischen Leitfähigkeit von Flüssigkeiten

    Country Status (4)

    Country Link
    US (1) US6369579B1 (de)
    EP (1) EP0990894B1 (de)
    AT (1) ATE346288T1 (de)
    DE (2) DE19844489A1 (de)

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    US7106067B2 (en) 2004-02-27 2006-09-12 Invensys Systems, Inc. Calibration plug for invasive and non-invasive electrodeless conductivity sensors and methods of using the same calibration plug
    US20070024287A1 (en) * 2005-08-01 2007-02-01 Mesa Laboratories, Inc. Apparatus and method for measuring liquid conductivity and electrode series capacitance
    CN100541208C (zh) * 2006-08-30 2009-09-16 梅特勒-托利多仪器（上海）有限公司 溶液电导率的测量方法
    WO2008030585A1 (en) * 2006-09-08 2008-03-13 Rosemount Analytical, Inc. Measuring conductivity of a liquid
    WO2008080108A1 (en) * 2006-12-22 2008-07-03 Paradigm Sensors, Llc Impedance spectroscopy (is) methods and systems for characterizing fuel
    DE102007014469A1 (de) * 2007-03-22 2008-09-25 Endress + Hauser Flowtec Ag Verfahren zur vorausschauenden Wartung und/oder Verfahren zur Bestimmung der elektrischen Leitfähigkeit bei einem magnetischinduktiven Durchflussmessgerät
    US20090115435A1 (en) * 2007-11-02 2009-05-07 Tomlinson Douglas F Processing System and Method for Hand-Held Impedance Spectroscopy Analysis Device for Determining Biofuel Properties
    FR2932893B1 (fr) * 2008-06-23 2010-12-10 Millipore Corp Procede et dispositif de mesure de conductivite d'un liquide pur ou ultrapur.
    FR2933490B1 (fr) * 2008-07-02 2010-08-27 Commissariat Energie Atomique Procede de mesure du debit d'un liquide en ecoulement dans un canal fluidique et dispositif de mise en oeuvre
    DE102008054659A1 (de) 2008-12-15 2010-06-17 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Konduktiver Leitfähigkeitssensor
    DE102009022443B4 (de) * 2009-05-23 2011-09-15 Manfred Völker Leitfähigkeits-Messzelle und Leitungsmodul einer Flüssigkeitsleitung
    DE102009024937A1 (de) * 2009-06-08 2010-12-09 Braatz, Udo, Dr. Verfahren und Anordnung zur Bestimmung von Flüssigkeitsparametern
    CN101726518B (zh) * 2009-12-24 2012-09-26 福建师范大学 溶液电导率的测量方法
    DE102010060465A1 (de) 2010-11-09 2012-05-10 Harald Riegel Verfahren zur Kalibrierung einer Leitfähigkeitsmesszelle
    DE102011002766A1 (de) 2011-01-17 2012-07-19 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Messanordnung zur Bestimmung einer elektrischen Leitfähigkeit einer Messflüssigkeit
    DE102011079572B4 (de) 2011-07-21 2024-12-05 Endress+Hauser Conducta Gmbh+Co. Kg Gradiometer zur Bestimmung der elektrischen Leitfähigkeit eines in einem Behältnis enthaltenen Mediums
    DE102011085310A1 (de) 2011-10-27 2013-05-02 Innovative Sensor Technology Ist Ag Verfahren zur Bestimmung mindestens einer intrinsischen Eigenschaften eines flüssigen Mediums und Vorrichtung zur Durchführung des Verfahrens
    US9488611B2 (en) 2012-01-20 2016-11-08 Rosemount Analytical Inc. Low-conductivity contacting-type conductivity measurement
    DE102012106384B4 (de) * 2012-07-16 2016-05-25 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Verfahren zur Ermittlung zumindest einer Fehlfunktion eines konduktiven Leitfähigkeitssensors
    DE102012106551A1 (de) 2012-07-19 2014-01-23 Endress & Hauser Meßtechnik GmbH & Co. KG Verfahren und Vorrichtung zur Kalibrierung eines Leitfähigkeitssensors
    CN103630752B (zh) * 2012-08-24 2016-05-04 福建师范大学 两种频率正弦波叠加信号激励的溶液电导率的测量系统
    US9410910B1 (en) 2013-05-23 2016-08-09 D-2 Inc. Hybrid conductivity sensor
    DE102013110042A1 (de) 2013-09-12 2015-03-12 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Elektrochemischer Sensor
    DE102014116415A1 (de) 2014-11-11 2016-05-12 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Gradiometer zur Bestimmung einer elektrischen Leitfähigkeit eines Mediums
    DE102016118526A1 (de) 2016-09-29 2018-03-29 Krohne Messtechnik Gmbh Leitfähigkeitsmessgerät zur Messung einer elektrischen Leitfähigkeit eines flüssigen Mediums
    US10598623B2 (en) 2017-05-24 2020-03-24 Rosemount Aerospace Inc. Four-wire conductivity cell circuit
    US10571419B2 (en) 2017-05-24 2020-02-25 Rosemount Aerospace Inc. Contacting type flow through conductivity cell
    CN107389935A (zh) * 2017-07-31 2017-11-24 重庆微奥云生物技术有限公司 一种病毒抗原的检测方法及病毒抗原探针包被方法
    CN107271497A (zh) * 2017-07-31 2017-10-20 重庆微奥云生物技术有限公司 一种蛋白质抗体检测系统及检测质量控制方法
    CN107367613A (zh) * 2017-07-31 2017-11-21 重庆微奥云生物技术有限公司 一种细菌抗原的检测方法及细菌抗原探针包被方法
    CN107271690A (zh) * 2017-07-31 2017-10-20 重庆微奥云生物技术有限公司 一种蛋白质抗原检测系统及检测质量控制方法
    JP7210916B2 (ja) * 2018-07-10 2023-01-24 横河電機株式会社 電磁流量計
    DE102018125789A1 (de) 2018-10-17 2020-04-23 Krohne Messtechnik Gmbh Leitfähigkeitssensor und Verfahren zur Herstellung eines Leitfähigkeitssensors
    DE102021105516B3 (de) * 2021-03-08 2022-06-30 Krohne Messtechnik Gmbh Verfahren zum Bestimmen einer Leitfähigkeit, Betriebsverfahren eines magnetisch-induktiven Durchflussmessgeräts und magnetisch-induktives Durchflussmessgerät
    DE102022104312A1 (de) 2022-02-23 2023-08-24 Endress+Hauser SE+Co. KG Kompensierte Leitfähigkeitsbestimmung
    DE102023123593A1 (de) 2023-09-01 2025-03-06 Endress+Hauser Conducta Gmbh+Co. Kg Vorrichtung zur induktiven Bestimmung der elektrischen Leitfähigkeit eines im Behälter enthaltenen Mediums

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    GB1121128A (en) * 1964-11-17 1968-07-24 Electronic Switchgear London L Improvements in or relating to liquid conductivity measuring cells
    US4227151A (en) * 1977-08-27 1980-10-07 Malcom-Ellis (Liverpool) Limited Measurement and monitoring of the electrical conductivity of liquor samples
    US5089780A (en) * 1989-10-04 1992-02-18 Hughes Aircraft Company Oil quality monitor sensor and system
    EP0580326A1 (de) * 1992-07-14 1994-01-26 Anatel Corporation Verfahren und Schaltungen zum Messen der Leitfähigkeit von Lösungen
    DE4233110A1 (de) * 1992-10-02 1994-04-07 Knick Elektronische Mesgeraete Verfahren zur Bestimmung der elektrischen Leitfähigkeit von Flüssigkeiten und Vorrichtung zu dessen Durchführung
    US5489849A (en) * 1994-03-14 1996-02-06 Massachusetts Institute Of Technology High accuracy calibration-free electrical parameter measurements using differential measurement with respect to immersion depth
    EP0911639A1 (de) * 1997-10-21 1999-04-28 Whirlpool Corporation Verfahren und Vorrichtung zur Kompensation der Drift der Leitfähigkeit einer Messzelle für ein Haushaltgerät

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    Patent Citations (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB1121128A (en) * 1964-11-17 1968-07-24 Electronic Switchgear London L Improvements in or relating to liquid conductivity measuring cells
    US4227151A (en) * 1977-08-27 1980-10-07 Malcom-Ellis (Liverpool) Limited Measurement and monitoring of the electrical conductivity of liquor samples
    US5089780A (en) * 1989-10-04 1992-02-18 Hughes Aircraft Company Oil quality monitor sensor and system
    EP0580326A1 (de) * 1992-07-14 1994-01-26 Anatel Corporation Verfahren und Schaltungen zum Messen der Leitfähigkeit von Lösungen
    DE4233110A1 (de) * 1992-10-02 1994-04-07 Knick Elektronische Mesgeraete Verfahren zur Bestimmung der elektrischen Leitfähigkeit von Flüssigkeiten und Vorrichtung zu dessen Durchführung
    US5489849A (en) * 1994-03-14 1996-02-06 Massachusetts Institute Of Technology High accuracy calibration-free electrical parameter measurements using differential measurement with respect to immersion depth
    EP0911639A1 (de) * 1997-10-21 1999-04-28 Whirlpool Corporation Verfahren und Vorrichtung zur Kompensation der Drift der Leitfähigkeit einer Messzelle für ein Haushaltgerät

    Also Published As

    Publication number Publication date
    ATE346288T1 (de) 2006-12-15
    EP0990894A2 (de) 2000-04-05
    US6369579B1 (en) 2002-04-09
    DE59913998D1 (de) 2007-01-04
    DE19844489A1 (de) 2000-03-30
    EP0990894B1 (de) 2006-11-22

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